#![allow(unused)]
use proc_macro2::{Punct, Spacing, TokenStream};

// None of our generated code requires the `From::from` error conversion
// performed by the standard library's `try!` macro. With this simplified macro
// we see a significant improvement in type checking and borrow checking time of
// the generated code and a slight improvement in binary size.
pub fn replacement() -> TokenStream {
    // Cannot pass `$expr` to `quote!` prior to Rust 1.17.0 so interpolate it.
    let dollar = Punct::new('$', Spacing::Alone);
    quote! {
        #[allow(unused_macros)]
        macro_rules! try_tmp {
            (#dollar __expr:expr) => {
                #dollar __expr?
            }
        }
    }
    // quote! {
    //     #[allow(unused_macros)]
    //     macro_rules! try_tmp {
    //         (#dollar __expr:expr) => {
    //             match #dollar __expr {
    //                 Ok(__val) => __val,
    //                 Err(__err) => {
    //                     return Err(__err);
    //                 }
    //             }
    //         }
    //     }
    // }
}
